condition mean min max ZT0-3 26.6 26.6 26.6 ZT4-7 24.1 24.1 24.1 ZT8-11 26.549999999999997 26.549999999999997 26.549999999999997 ZT12-15 27.15 27.15 27.15 ZT16-19 22.6 22.6 22.6 ZT20-23 35.2 35.2 35.2